Table 3.

Summary of reproducibility testing

Method†	Intra-observer κ			Inter-observer κ			Intra-observer ICC			Inter-observer ICC
	κ	95% CI		κ	95% CI		ICC	95% CI		ICC	95% CI
		LL	UL		LL	UL		LL	UL		LL	UL
Max. Apical FD	0.9***	0.7	1.2	0.9***	0.7	1.2	0.97	0.95	0.98	0.96	0.93	0.97
Global LV FD	0.9***	0.6	1.2	0.9***	0.6	1.1	0.98	0.97	0.99	0.97	0.95	0.98
Perimetry	0.9***	0.6	1.2	0.9***	0.7	1.3	0.98	0.97	0.99	0.98	0.96	0.99
Petersen	0.8**	0.5	1.0	0.7**	0.4	0.9	0.89	0.82	0.93	0.83	0.73	0.89
Jacquier	0.5*	0.2	0.8	0.5*	0.3	0.9	0.86	0.87	0.95	0.89	0.82	0.93

*** Excellent agreement between ratings, κ of > 0.8.

** Strong agreement, κ of 0.61 – 0.8.

* Moderate agreement, κ of 0.41 – 0.6.

† For maximal apical FD, global LV FD and perimetry, cut-off values for LVNC diagnoses were derived from ROC analysis. For Petersen and Jacquier techniques, cut-off values for LVNC diagnoses were derived from previously published thresholds.

ICC = intraclass correlation coefficient; κ = Fleiss’ kappa; ROC = receiver operating characteristics; other abbreviations as in Tables 1 and 2.